Check valve



Aug. 28,1945. J. HlRsHsTElN 2,383,482

CHECK VALVE Filed Nov. 26, 1943 2 Sheets-Sheet 2 JNVENTOR E95 l y Joscm Hmsnsfcm.

Patented Aug. 28, 1945 UNITED STATES PATENT OFFICE I l -asssnsa CHECK VALVE JosephHirshsteimCleveland, Ohio, assignor of one-half to Ruth RsNewman and one-half to Mildred llirshstein, both of Cleveland, Ohio Application November 26, 1943, serial No. 511,808

"2 Claims. 251-123) This invention` relates to `a back waterv check valve of the pivoted swing-check type particularly adaptable to surface drain structure wherein the check valve mechanism is located. the riser leg of the trap formation comprising, part of the drain structure. Such valve mechanism, heretofore, comprised a swingable valve member which is swung downwardly upon'a valve seat or surface which is disposed at an angle to` both the horizontal and the vertical. The function of such valves is the control of flow in a4 drain line orthe like, where there is danger Tof back water surging back into the line from the main sewer and up throughthe surface drain.

More particularly myvinvention is 'concerned with a' surface drain side swing valve which,v is normally closed, but whichv will become unseated under` the infiuence of a low water head yof sur` face vdrainage water andV allow the passing of the water inthe direction of the outlet at`` a very low pressure. On 4the other hand, thevalve will My novel back water check valve is particularly usefulA in a surface drain when combined with aV deep seal trap and the embodiment shown the drawings illustrates that form of application. j

To the accomplishment of the foregoing and related ends, said invention, then, consists of the' means hereinafter fullyl described and particularly pointed out in the claims; the annexed drawings and the following description setting forth in detail certain structure embodying the invention, such disclosed structure constituting, however, but one of various forms in which the prin- -ciple of the invention may be used.

In said annexed drawings- Fig. 1 illustrates a surface drain construction, shown in dotted lines, with the riser pipe or outlet trap leg having the valve according to the be firmly closedunder4 the pressure of back water invention mounted thereon and shown partly in ner.

y plainedlA The upper or outlet end of the elbow I5 may Fig. ,3 is afront elevation of the valve of Fig. 1 on a larger scale and with part of the valve disk broken away Fig. 4 is a front elevation on a still larger scale of the valve body shown in Figs. l and 3 supporting the valve disk and the mounting therefor, the disk being shown in section in an open position; and

. Fig. 5 is a perspective view of the disk supporting arm.

, As illustrated in Fig. l, the valve according to my invention ismounted in the median part of the outlet leg of a deep seal trap II of a drain Ii).y Deep seal'trap II is provided with a cleanout l2 having its top. aligned with the top of the drain Ill.

- The b'ack water check valve mechanism, which is generally designated by I4, is supported by a valve body, hereafter referred to as an elbowA I5. The elbow, as shown in Figs. 1, 3 and 4, has its bottom end I6 shown as being disposed ina horizontal position, whereas the elbow in Fig. 2 shows a valve in which the plane of the bottom ksurface of the valve body or elbow I5 is disposed o r formed in a plane at a slight angle with the horizontal. The purpose of this will be explained v more fully later on. l

As more clearly shown in Figs. 2 to 4 inclusive, the elbow` I5 carries in its upper portion a supporting, bracket I9 with projection lugs 20 adapted to receive a trunnion bearing for pivotally mountingthe valve disk thereon. These lugs may beformed as an integral part of the elbow or they lmay be vattached in a convenient man- E'ach of the lugs 20 has an externally threaded bore which engages with a threaded bolt` 2|; lock nuts 22` are provided for fastening the bolts after they have been adjusted in proper relation to -thepivot sockets 3l, as will be exterminate in a flange I3 which forms a seat for the valve disk 23, the seating face being an inclined plane with respect to the vertical as shown, or being in the vertical plane. Disk 23 is loosely supported by an arm 24 in a hub-shaped end 25 thereof. A stubshaft or lug 26, integrally formed on disk 23 or attached thereto, is loosely tted in said hub end 25 and held therein by an annulus 21 over which the shaft 2B is peened asl shown at 33. The loose connection between the disk and its supporting arm makes it possible for the disk to adjust itself to proper seating position. l

Theother end of arm 24 is T-shaped, the two l disk 23 and the T-bar intermediate ends 28 are In order to compensate- A parallel to bracket I9. for this difference arm 24 has a bend in it as sho-wn in Fig. 5.

As will be seen from Fig. 2 of the drawings the' bearing axis of the trunnion bearingVwh'ich is identical with the swinging axis ofarm 24,-, lies on a plane passing through the bolts 2| and the bearing sockets 3| and isslightly offset withl` respect to the vertical position. In the position of the elbow shown in Fig. 2 the valve disk is swung toy closed position byg'ravty partly by reason of the slight tilt of the elbow toward thedrain opening and partly by the offset position of the swinging axis of the disk. However, it has been mentlonedl above that the valve disk should respond tothe slightest pressure differential within the line to open up and let drainage water pass through to the outlet side. By predetermining the amount of the drainward tilt of the elbow or valve body I5 coupled with a predetermined amount of tilt of the swinging axis so that, the gravitational influence is just sufficient to cause the disk to be swung to a closed orV seated position, a sensitive supporting of the disk is obtained. If the elbow is mountedy as thus explained any pressure prevailing upon the disk by a iiowing liquid will be sufficient to open the valve disk. and let water pass, but the valve disk will return automatically to closed positionl as soon asv the flow ceases.`

Referring to the valve shown in Fig. 2, the plane of the lower end edge of the elbow l5 is at a slight angle to horizontal so that by forming the seat on the trap Il for the elbow in a plane at a corresponding angle to horizontal, an adjustment of ther olosingtendencyof the valve may be effected according to the position in which theA valve elbow lisseated on the trap. l

With customary constructions such response to pressure differential is not reliable, because the valvey disk; once seated, has'a tendencyv to remain iny that position until a very substantial pressure from the inlet sidecould push it open. 'I-hisisduel to the fact that-'the swinging axis of thev disk has been disposed heretofore to extend horizontally and at a position at the top of the elbow.v With the means above indicated I am able to overcome any such tendency of the valvemember to lag, the slightest pressure from the inlet` ,side being suflicient to open the valve disk at all .Claim as my invention:

1. In a back water check valve mechanism for a drain line, an elbow fitting having an inlet port, at, one end and an outlet port at the other endg. a seating face,- on the outlet end thereof in an inclinedl plane, with respect to the axis of the inlet port; means carried on said fitting for supporting a valve disc; a valve disc mounted on said m'eansand constructed and arranged to normally seek a closed position but capable of being opened by slight fluidv pressure withinl the fitting, the mountingV for said disc comprising a supporting arm pivo'tally` mounted atA one end on said disc supporting means and having its other end loosely connected to said disc; a trunnion' bearing for effecting' said pivotal connection', said bearing having a center line at a slight angle to the axis of the inletL port, said angle being smaller than the angleI of inclination of the seating face, said elbowA having its .bottom edge in a plane at a slight angle to a plane normal to the axis of the inlet port-whereby the'sensitivity of the valve disc to the fiuidi pressure differential may be partially adjustedI during installation.

2a a back water' checkv valve mechanism for ai drainv line, an elbow fitting having an inlet portI aty one end andv an outlet port at'the other end', a seating `face onl the outlet end thereof in aninclined planewith respect to the axis of the inlet port; ai means carried on said fitting for supporting: a valvedisc; a valve disc mounted on said; supporting means andv constructed and' arrangedr to normally seek a closed position but ca pablefof beingopened by slight uid presure,

' themountingfor saiddi'sc'comprising a supportinga-rm pivotally mounted at one end on said supporting means and havingfits other end loosely connectedto said disc; a trunnion bearing for effecting said pivotal connection, said bearing having a centerline ata slight angle'to the axis of the-inlet port, said angle'being smaller than they angle Aof inclination of the seating face, said Valve disc supporting,` armA being formed' with a benduto compensatefor said difference in inclination,y said-elbow' having its bottom edge in a planeat a slight' angle to a'plane normal to the axis'of--the inletA port whereby the sensitivity of the-valve-disc'to the fluid pressure 'differential may be-partlallyadjusted during installation; JOSEPH HIWRSHSTEIN. 

